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0.8(70-x)+0.35x=0.5(70)
We move all terms to the left:
0.8(70-x)+0.35x-(0.5(70))=0
We add all the numbers together, and all the variables
0.8(-1x+70)+0.35x-(0.57)=0
We add all the numbers together, and all the variables
0.35x+0.8(-1x+70)-0.57=0
We multiply parentheses
0.35x-0.8x+56-0.57=0
We add all the numbers together, and all the variables
-0.45x+55.43=0
We move all terms containing x to the left, all other terms to the right
-0.45x=-55.43
x=-55.43/-0.45
x=123+0.079999999999998/0.45
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